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6PPD Ozone-oxidation Overview
6PPD is an organic chemical widely used as stabilising additive (or antidegradant) in rubbers, such as NR, SBR and BR; all of which are common in vehicle tires. Although it is an effective antioxidant it is primarily used because of its excellent antiozonant peformance. It is one of several antiozonants based around ''p''-phenylenediamine (PPD). Manufacturing 6PPD is prepared by reductive amination of methyl isobutyl ketone with 4-aminodiphenylamine. This produces a racemic mixture. Application 6PPD is a common rubber antiozonant, with a major application in vehicle tires. It is mobile within the rubber and is slowly forced to the surface via blooming. Here it forms a "scavenger-protective film", reacting with the ozone more quickly that the ozone can react with the rubber. This process initially forms aminoxyl radicals and was thought to stop at the quinone diimine, but is now known to continue to form quinones, amongst other products. Despite 6PPD being used in tires sinc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Organic Chemical
In chemistry, organic compounds are generally any chemical compounds that contain carbon-hydrogen or carbon-carbon bonds. Due to carbon's ability to catenate (form chains with other carbon atoms), millions of organic compounds are known. The study of the properties, reactions, and syntheses of organic compounds comprise the discipline known as organic chemistry. For historical reasons, a few classes of carbon-containing compounds (e.g., carbonate salts and cyanide salts), along with a few other exceptions (e.g., carbon dioxide, hydrogen cyanide), are not classified as organic compounds and are considered inorganic. Other than those just named, little consensus exists among chemists on precisely which carbon-containing compounds are excluded, making any rigorous definition of an organic compound elusive. Although organic compounds make up only a small percentage of Earth's crust, they are of central importance because all known life is based on organic compounds. Living thing ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coho Salmon
The coho salmon (''Oncorhynchus kisutch;'' Karuk: achvuun) is a species of anadromous fish in the salmon family and one of the five Pacific salmon species. Coho salmon are also known as silver salmon or "silvers". The scientific species name is based on the Russian common name ''kizhuch'' (кижуч). Description During their ocean phase, coho salmon have silver sides and dark-blue backs. During their spawning phase, their jaws and teeth become hooked. After entering fresh water, they develop bright-red sides, bluish-green heads and backs, dark bellies and dark spots on their backs. Sexually maturing fish develop a light-pink or rose shading along the belly, and the males may show a slight arching of the back. Mature adults have a pronounced red skin color with darker backs and average and , occasionally reaching up to . They also develop a large kype (hooked beak) during spawning. Mature females may be darker than males, with both showing a pronounced hook on the nose. Re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rotifer
The rotifers (, from the Latin , "wheel", and , "bearing"), commonly called wheel animals or wheel animalcules, make up a phylum (Rotifera ) of microscopic and near-microscopic pseudocoelomate animals. They were first described by Rev. John Harris in 1696, and other forms were described by Antonie van Leeuwenhoek in 1703. Most rotifers are around long (although their size can range from to over ), and are common in freshwater environments throughout the world with a few saltwater species. Some rotifers are free swimming and truly planktonic, others move by inchworming along a substrate, and some are sessile, living inside tubes or gelatinous holdfasts that are attached to a substrate. About 25 species are colonial (e.g., '' Sinantherina semibullata''), either sessile or planktonic. Rotifers are an important part of the freshwater zooplankton, being a major foodsource and with many species also contributing to the decomposition of soil organic matter. Most species of the r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Washington State University
Washington State University (Washington State, WSU, or informally Wazzu) is a public land-grant research university with its flagship, and oldest, campus in Pullman, Washington. Founded in 1890, WSU is also one of the oldest land-grant universities in the American West. With an undergraduate enrollment of 24,278 and a total enrollment of 28,581, it is the second largest institution for higher education in Washington state behind the University of Washington. It is classified among "R1: Doctoral Universities – Very high research activity". The WSU Pullman campus stands on a hill and is characterized by open spaces and a red brick and basalt material palette—materials originally found on site. The university sits within the rolling topography of the Palouse in rural eastern Washington and remains closely connected to the town and the region. The university also operates campuses across Washington at WSU Spokane, WSU Tri-Cities, and WSU Vancouver, all founded in 1989. In ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Washington Department Of Ecology
The Washington State Department of Ecology (sometimes referred to simply as "Ecology") is the state of Washington's environmental regulatory agency. Created in February 1970, it was the first environmental regulation agency in the U.S. predating the creation of the Environmental Protection Agency (EPA) by several months. The department administers laws and regulations pertaining to the areas of water quality, water rights and water resources, shoreline management, toxics clean-up, nuclear waste, hazardous waste, and air quality. It also conducts monitoring and scientific assessments. Duties The agency has an operating budget of approximately $459 million, a capital budget of approximately $325 million and close to 1600 employees The department's authorizing statute is RCW 43.21A. It is responsible for administering the Shoreline Management Act (RCW 90.58), the Water Code (RCW 90.03), the state Water Pollution Control Act (RCW 90.48), the state Clean Air Act (RCW 70.94), and th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ohop Valley
Ohop Valley is an agricultural region in Pierce County, Washington, United States. It is located between Roy and Eatonville, and contains the unincorporated settlement of Ohop. Ohop Creek, which runs through the valley, feeds into Ohop Lake and its waters eventually join the Puyallup River. Prior to settlement in the 1880s by Norwegian immigrants, the area was owned by local Native Americans who assisted new farmers. The town of Ohop also had a small mineral spring that was used to bring tourists to the area, along with its views of nearby Mount Rainier. The Ohop Valley also remains a hub for local logging. Part of the valley is now owned by a land trust managed by the Nisqually Indian Tribe to restore salmon habitat near Ohop Creek. One of the historic barns in the Ohop Valley was acquired by the Eatonville School District and is planned to house a STEM Stem or STEM may refer to: Plant structures * Plant stem, a plant's aboveground axis, made of vascular tissue, off which ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nisqually People
The Nisqually is a Lushootseed-speaking Native American tribe in western Washington state in the United States. They are a Southern Coast Salish people. They are federally recognized as the Nisqually Indian Tribe, formerly known as the Nisqually Indian Tribe of the Nisqually Reservation and the Confederated Tribes of the Chehalis Reservation. The tribe lives on a reservation in the Nisqually River valley near the river delta. The Nisqually Indian Reservation, at , comprises 20.602 km² (7.955 sq mi) of land area on both sides of the river, in western Pierce County and eastern Thurston County. In the 2000 census, it had a resident population of 588 persons, all in the Thurston County portion, on the southwest side of the Nisqually River. The tribe moved onto their reservation east of Olympia, Washington, in late 1854 with the signing of the Medicine Creek Treaty. As reaction to the unfairness of the treaty, many members of the tribe led by Chief Leschi engaged and were ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Median Lethal Dose
In toxicology, the median lethal dose, LD50 (abbreviation for "lethal dose, 50%"), LC50 (lethal concentration, 50%) or LCt50 is a toxic unit that measures the lethal dose of a toxin, radiation, or pathogen. The value of LD50 for a substance is the dose required to kill half the members of a tested population after a specified test duration. LD50 figures are frequently used as a general indicator of a substance's acute toxicity. A lower LD50 is indicative of increased toxicity. The test was created by J.W. Trevan in 1927. The term semilethal dose is occasionally used in the same sense, in particular with translations of foreign language text, but can also refer to a sublethal dose. LD50 is usually determined by tests on animals such as laboratory mice. In 2011, the U.S. Food and Drug Administration approved alternative methods to LD50 for testing the cosmetic drug Botox without animal tests. Conventions The LD50 is usually expressed as the mass of substance administered per unit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Environmental Science & Technology Letters
''Environmental Science & Technology Letters'' is an online-only peer-reviewed scientific journal publishing brief research reports in the fields of environmental science and technology. It was first opened to submissions in 2013, with its first articles published online in January 2014. It was established by the American Chemical Society to serve as a sister journal to their existing journal, ''Environmental Science & Technology'', with an expedited time to publication. To this end, the journal publishes all articles as soon as publishable after acceptance, though they are also summarized in monthly issues. The editor-in-chief is Prof. Bryan Brooks (Baylor University). According to the ''Journal Citation Reports'', the journal has a 2019 impact factor of 7.678. See also *Environmental Science & Technology ''Environmental Science & Technology'' is a biweekly peer-reviewed scientific journal published since 1967 by the American Chemical Society. It covers research in environmenta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rainbow Trout
The rainbow trout (''Oncorhynchus mykiss'') is a species of trout native to cold-water tributaries of the Pacific Ocean in Asia and North America. The steelhead (sometimes called "steelhead trout") is an anadromous (sea-run) form of the coastal rainbow trout or Columbia River redband trout that usually returns to freshwater to spawn after living two to three years in the ocean. Freshwater forms that have been introduced into the Great Lakes and migrate into tributaries to spawn are also called steelhead. Adult freshwater stream rainbow trout average between , while lake-dwelling and anadromous forms may reach . Coloration varies widely based on subspecies, forms, and habitat. Adult fish are distinguished by a broad reddish stripe along the lateral line, from gills to the tail, which is most vivid in breeding males. Wild-caught and hatchery-reared forms of the species have been transplanted and introduced for food or sport in at least 45 countries and every continent except ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brook Trout
The brook trout (''Salvelinus fontinalis'') is a species of freshwater fish in the char genus ''Salvelinus'' of the salmon family Salmonidae. It is native to Eastern North America in the United States and Canada, but has been introduced elsewhere in North America, as well as to Iceland, Europe, and Asia. In parts of its range, it is also known as the eastern brook trout, speckled trout, brook charr, squaretail, brookie or mud trout, among others. A potamodromous population in Lake Superior, as well as an anadromous population in Maine, is known as coaster trout or, simply, as coasters. The brook trout is the state fish of nine U.S. states: Michigan, New Hampshire, New Jersey, New York, North Carolina, Pennsylvania, Vermont, Virginia, and West Virginia, and the Provincial Fish of Nova Scotia in Canada. Systematics and taxonomy The brook trout was first scientifically described as ''Salmo fontinalis'' by the naturalist Samuel Latham Mitchill in 1814. The specific epithet "''fontina ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Los Angeles Times
The ''Los Angeles Times'' (abbreviated as ''LA Times'') is a daily newspaper that started publishing in Los Angeles in 1881. Based in the LA-adjacent suburb of El Segundo since 2018, it is the sixth-largest newspaper by circulation in the United States. The publication has won more than 40 Pulitzer Prizes. It is owned by Patrick Soon-Shiong and published by the Times Mirror Company. The newspaper’s coverage emphasizes California and especially Southern California stories. In the 19th century, the paper developed a reputation for civic boosterism and opposition to labor unions, the latter of which led to the bombing of its headquarters in 1910. The paper's profile grew substantially in the 1960s under publisher Otis Chandler, who adopted a more national focus. In recent decades the paper's readership has declined, and it has been beset by a series of ownership changes, staff reductions, and other controversies. In January 2018, the paper's staff voted to unionize and final ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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